Potatos, and caulk tubes were really the only stuff i shot when I had a 2" barrel, although I found it to be quite large and switched to 1.5". Then as of present I have migrated to the use of 1.5" SDR-21 and have something like 200 pounds of GB's stock piled.

Golf balls shoot great out of my 2" barrel, I use a tight fitting wash cloth behind them for a buffer and just drop the golf ball on top, I've shot a gold ball a over a 1/10 of a mile and one went 2/10 of a mile....

I shot an arrow 1/2 a mile and unfortunately it stuck in someones roof don't tell anyone